Where to start with this... well... I am going to start some myth-busting.
So the N90s (or F90x) is from the mid-90s? Isn't shooting film about getting to the heart of manual exposure, and diving back to the basics of photography?
Street photography is a really common form of photography, as it is relatively easy to get into—and it's simple to start doing it, and it comes with no guilt, as the law says you can do it.The question is, should you? Saying, "the law lets anyone photograph on the street" doesn't answer the question. Street photography is about artistically displaying, or glamorising the normal day to day events.
Posing someone is only one part of portraits, as are the camera settings. These two get all the attention, and they don't really deserve it. What is more important is understanding what you are taking, and why you are taking it.
I am going to start by saying this article isn't about the actual ways you should or shouldn't frame a photo, but instead about the abstract idea of language.
What does shutter speed do? I believe that is a good place to start.